HP Fortran Programmer's Guide (September 2007)

Glossary
ttv
Glossary254
program can detect. Such a program can be
designed to handle traps. HP Fortran 90
provides the ON statement to handle traps.
ttv A tool for analyzing parallel-executing
programs.
tty buffering A method for efficiently
processing data that is directed to standard
output by capturing it in a buffer before
sending it to the screen.
underflow An exception condition that
occurs when the result of a floating-point
operation is smaller than the smallest
normalized number. On systems that
support it, fast underflow is an efficient
method of handling this exception.
vectorization An optimization technique
that replaces eligible program loops that
operate on arrays with calls to specially
tuned routines that perform the same
operation.
wall-clock time Time spent by an
executing program that includes system
time as well as process time. In contrast,
virtual time takes into account process time
only. Profilers (such as CXperf) that track
both virtual time and wall-clock time provide
information about when a program is
blocked as well as when it is running.